DEVICES AND FORMULATIONS FOR DETECTING, SCREENING AND MONITORING LEVELS OF CERTAIN CONSTITUENTS IN BODILY FLUIDS AND METHOD

Description

[0001] The present invention relates generally to devices and formulations for reagents employed in such devices that enable detecting, screening and monitoring levels of certain constituents in bodily fluids sampled from humans and animals, and pertains, more specifically, to the construction and manufacture of such devices.

[0002] In two earlier United States patents, Nos. 7,824,344 and 7,993,283, there is disclosed methods and apparatus for conducting a non-invasive analysis of saliva. The present invention provides formulations and devices that enable a user to employ a bodily fluid, such as saliva or another oral fluid, serum or plasma, utilizing devices that provide color changes to indicate the presence and level of a certain constituent in the bodily fluid. Further, the present invention provides methods of construction and manufacture that enable such devices to be made available for widespread use for detecting, screening or monitoring the presence and level of any one of a plurality of certain constituents with increased ease and economy. As such, the present invention attains several objects and advantages, some of which are summarized as follows: Provides devices of simplified construction for widespread use in detecting, screening and monitoring the presence and level of any selected one of a plurality of certain constituents in bodily fluids; enables an exceptionally rapid response in a quick and easy non-invasive procedure for determining the presence and level of a particular constituent in a bodily fluid; provides for the economical manufacture and distribution of devices capable of detecting, screening and monitoring the presence of certain constituents in bodily fluids; makes available a simplified visual reading of a color change to determine the presence and level of a certain constituent in a bodily fluid; provides an economical and reliable device for simplified use in detecting, screening or monitoring the presence of a selected certain constituent in a bodily fluid; encourages widespread use to the benefit of a larger number of users who can enjoy greater economy and convenience in reaching and maintaining higher goals in healthcare.

[0003] The above objects and advantages are attained by the present invention, which may be described briefly as a method of making a device for conducting a non-invasive analysis of a bodily fluid to determine the presence and the level of a certain constituent carried by the bodily fluid, the device including an indicator formulation capable of changing color in response to exposure to the certain constituent to provide a visible indication of the presence and the level of the certain constituent carried by the bodily fluid, the method comprising: providing a carrier substrate of a fibrous non-woven material having voids establishing a high void volume within the carrier substrate wherein the carrier substrate has a total volume and the high void volume is within a range of about ten to twelve percent of the total volume; applying a chromagen formulation to the carrier substrate to create a chromagen-laden carrier member with the chromagen formulation in the form of a layer carried by the fibers of the carrier material and placed in juxtaposition with voids in the carrier substrate; and subsequently applying to the chromagen-laden carrier member a selected reagent having a particular constituent-specific formulation to combine the selected reagent with the chromagen formulation applied to the carrier substrate, thereby establishing the indicator formulation within the carrier substrate in place for reception of a sample of the bodily fluid later placed upon the carrier substrate.

[0004] In addition, the invention provides a device for conducting a non-invasive analysis of a bodily fluid to determine the presence and the level of a certain constituent carried by the bodily fluid, the device including an indicator formulation capable of changing color in response to exposure to the certain constituent to provide a visible indication of the presence and the level of the certain constituent carried by the bodily fluid, the device comprising: a carrier substrate of a fibrous non-woven material having voids establishing a high void volume within the carrier substrate wherein the carrier substrate has a total volume and the high void volume is within a range of about ten to twelve percent of the total volume; and an indicator formulation in the form of a layer carried by the fibers of the carrier substrate placed in juxtaposition with voids in the carrier substrate, the indicator formulation consisting essentially of a chromagen formulation and a constituent-specific formulation selected from formulations responsive to levels of any one of a plurality of different certain constituents.

[0005] The invention will be understood more fully, while still further objects and advantages will become apparent, in the following detailed description of preferred embodiments of the invention illustrated in the accompanying drawing, in which:

FIG. 1 is a pictorial view of a device constructed in accordance with the present invention;

FIG. 2 is an enlarged, somewhat diagrammatic, cross-sectional view taken along line 2-2 of FIG. 1;

FIG. 3 is a flow diagram illustrating a method of the present invention;

FIG. 4 is a plan view of another device constructed in accordance with the present invention;

FIG. 5 is a pictorial view showing use of the device of FIG. 4;

FIG. 6 is a pictorial view showing the use of still another device constructed in accordance with the present invention; and

FIG. 7 is a pictorial view showing the use of yet another device constructed in accordance with the present invention.

[0006] Referring now to the drawing, and especially to FIGS. 1 and 2 thereof, a device constructed in accordance with the present invention is shown at 20 and is seen to include a carrier substrate in the form of a pad 22 of a material having voids 24 establishing a high void volume within the pad 22. An indicator formulation is carried by the pad 22 and is illustrated at 30 in the form of a layer 32 carried by fibers 34 of the material, in juxtaposition with voids 24 within the pad 22. Indicator formulation 30 consists essentially of a chromagen formulation and a reagent having a constituent-specific formulation selected from formulations responsive to one of a plurality of constituents, as will be set forth in greater detail below. Suffice it to say at this juncture that the reagent having a constituent-specific formulation and the chromagen formulation are combined within the pad 22 such that the indicator formulation 30 is capable of changing color in response to exposure to the certain constituent to provide a visible indication on the pad 22 of the presence and the level of the certain constituent carried by a sample of a bodily fluid applied to the pad 22.

[0007] Thus, upon applying a sample of a bodily fluid, such as a saliva sample, to the pad 22, placed at a target area 36 of the device 20, the occurrence of a visible color change will provide at least a qualitative indication of the presence of the particular specific constituent to which the constituent-specific formulation will react. An absence of any visible color change will indicate that the specific constituent is not present in any significant amount in the saliva sample.

[0008] The preferred material for pad 22 is a non-woven fibrous material which provides the requisite high void volume. The high void volume provides pad 22 with the ability to absorb rapidly the sample of bodily fluid applied to the target area 36, to enable rapid interaction of the sample with the indicator formulation 30, and to maximize exposure of the interacting sample and indicator formulation to ambient air for promoting a quick response through accelerating a reaction between the certain constituent carried by the sample and the indicator formulation. Non-woven synthetic polymeric materials are available commercially, one such material being a non-woven polyester fibrous material. Suitable glass-fiber non-woven fibrous materials and cellulose non-woven fibrous materials also are available commercially in forms suitable for use in the construction of pad 22.

[0009] Device 20 is constructed in several different variations such that one variation is available to provide a visible color change as an indication of at least the presence of a corresponding one of several certain constituents, namely, glucose, cholesterol, ethanol, uric acid and galactose, and, preferably, the level of the certain constituent, in the sample of bodily fluid applied to the target area 36 of the pad 22. Each variation requires that the pad 22 carry a formulation specific to the constituent to be detected, as a component of the indicator fromulation 30; however, the chromagen formulation remains unchanged among the different variations of the pad 22 so that the same chromagen formulation can serve in every variation of the pad 22. Accordingly, the manufacture and distribution of the devices 20 is simplified and rendered more economical, as will be described below.

[0010] Turning now to FIG. 3, as well as to FIGS. 1 and 2, pad 22 of device 20 is manufactured by first applying to the material of pad 22 the chromagen formulation, as seen in step 40, to create a chromagen-laden carrier member in the form of pad 22 with the chromagen formulation placed in juxtaposition with voids 24 of the pad 22. Subsequently, a selected reagent having a particular constituent-specific formulation is applied to the chromagen-laden carrier member, as indicated at step 42, to combine the selected reagent with the chromagen formulation applied earlier to the material of pad 22, thereby establishing the indicator formulation 30 within the completed pad 22. Pad 22 is placed at target area 36 of device 20 for reception of the sample of bodily fluid upon the pad 22. Since the chromagen formulation remains the same for all variations of the device 20, economies are realized in the manufacturing process which requires only one component common to all variations and only one station for the application of that common component; however, further economy and convenience are accomplished by the ability to store the intermediate product, that is, the material of pad 22 with the applied chromagen formulation, is stored, as seen in step 44. Subsequently applying any selected one of the constituent-specific formulations is applied, at a later time, in accordance with the requirement for any number of a particular device or particular devices, the completed carrier member with the indicator formulation being available at step 46. The ability to have on hand a supply of the basic chromagen-laden carrier member for subsequent combination with a selected constituent-specific formulation, as opposed to immediately creating an inventory of completed carrier members, as indicated by procedure 48, reduces the necessity for maintaining on-hand a large inventory of every variety of completed device 20 while increasing the flexibility and turnaround time of filling the demand for any number of devices 20 in any one of the different varieties.

[0011] With respect to the varieties identified above, the common chromagen formulation consists essentially of the following components, in an example prepared as follows: Approximately equal volumes of about 0.05 to 0.5 M MBTH in distilled water is mixed with about 0.05 to 0.5 M DMAB in ethanol. The mixture is impregnated into the material of the carrier member and the impregnated material subsequently is dried, leaving the material with the chromagen formulation coated upon the fibers of the material.

[0012] With respect to each of the varieties identified above, the following constituent-specific formulations are effective, and an example of the preparation of each is set forth below:

For the determination of the presence and level of glucose as the certain constituent in a bodily fluid, a constituent-specific formulation consists essentially of the following components, in an example prepared as follows: Dissolve approximately equal amounts of the enzymes glucose oxidase with an activity of approximately 200 U/mg and peroxidase with an activity of approximately 200 U/mg in distilled water in the presence of approximately equal amounts of 0.05 to 0.5 M HEPES, a blend of surface active agents within the range of about 0.1% to 10% each, and a stabilizer, the preferred stabilizer being a PVP/copolymer complex in which the copolymer is methylvinylether/maleic anhydride, available commercially under the trademark GANTREZ®, the complex being prepared from 5% PVP K30 in distilled water and 5% GANTREZ® AN 139 at a pH of about 7.5. The prepared constituent-specific formulation then is impregnated into the material previously impregnated with the chromagen formulation to complete a pad 22 having an indicator formulation 30 responsive to the presence and level of glucose in an applied sample of a bodily fluid.

[0013] For the determination of the presence and level of cholesterol as the certain constituent in a bodily fluid, a constituent-specific formulation consists essentially of the following components, in an example prepared as follows: Dissolve approximately equal amounts of the enzymes cholesterol esterase with an activity of approximately 180U/mg and peroxidase with an activity of approximately 200 U/mg and twice as much cholesterol oxidase with an activity of approximately 47 U/mg) in distilled water in the presence of approximately equal amounts of 0.05 to 0.5 M HEPES, a blend of surface active agents within the range of about 0.1% to 10% each, and a stabilizer, the preferred stabilizer being a PVP/copolymer complex in which the copolymer is methylvinylether/maleic anhydride, available commercially under the trademark GANTREZ®, the complex being prepared from 5% PVP K30 in distilled water and 5% GANTREZ® AN 139 at a pH of about 7.5. The prepared constituent-specific formulation then is impregnated into the material previously impregnated with the chromagen formulation to complete a pad 22 having an indicator formulation 30 responsive to the presence and level of cholesterol in an applied sample of a bodily fluid.

[0014] For the determination of the presence and level of ethanol as the certain constituent in a bodily fluid, a constituent-specific formulation consists essentially of the following components, in an example prepared as follows: Mix together approximately equal amounts of about 1% to 20% PVP K30 in distilled water, about 0.5% to 5% ethoxylated surfactant in distilled water and about 0.05 to 0.5 M phosphate buffer at pH 8.5 together with one-half the same amount of alcohol oxidase with an activity of approximately 400 U/ml and one-quarter the same amount of peroxidase with an activity of approximately 200 U/mg. The prepared constituent-specific formulation then is impregnated into the material previously impregnated with the chromagen formulation to complete a pad 22 having an indicator formulation 30 responsive to the presence and level of ethanol in an applied sample of a bodily fluid.

[0015] For the determination of the presence and level of uric acid as the certain constituent in a bodily fluid, a constituent-specific formulation consists essentially of the following components, in an example prepared as follows: In approximately one-hundred ml of 0.05 to 0.5 M phosphate buffered saline at pH 6.4, mix together approximately ten mg of uricase, fifteen mg of ascorbate oxidase and about six mg of peroxidase with an activity of approximately 200 U/mg. The prepared constituent-specific formulation then is impregnated into the material previously impregnated with the chromagen formulation to complete a pad 22 having an indicator formulation 30 responsive to the presence and level of uric acid in an applied sample of a bodily fluid.

[0016] For the determination of the presence and level of galactose as the certain constituent in a bodily fluid, a constituent-specific formulation consists essentially of the following components, in an example prepared as follows: Mix together approximately five ml each of about 0.05 to 0.5 M phosphate buffer at pH 7.0, peroxidase with an activity of about 200 U/mg, and ethanol (95%) together with about twenty-five ml of 10% polyvinyl alcohol in distilled water and 4200 units of galactose oxidase. The prepared constituent-specific formulation then is impregnated into the material previously impregnated with the chromagen formulation to complete a pad 22 having an indicator formulation 30 responsive to the presence and level of galactose in an applied sample of a bodily fluid.

[0017] In the embodiment of the invention illustrated in FIG. 4, a disk-shaped device 100 includes a pad 110 constructed of the material previously described in connection with pad 22 of device 20. Pad 110 provides a target area 112 which, in device 110, is substantially surrounded by an integrated color gauge 114 having patches 116 of different colors that can be matched visually with a color change at the target area 112. As in the devices disclosed in the aforesaid patents, Nos. 7,824,344 and 7,993,283, alpha-numeric characters may be displayed in juxtaposition with the patches 116 for a direct reading of the level detected. In this manner, device 100 provides a simple semi-qualitative/semi-quantitative measure of the presence and level of a particular certain constituent carried by a sample of bodily fluid applied to the target area 112. The semi-qualitative/semi-quantitative indication, while more comprehensive than the generally qualitative indication provided by device 20 described above, is convenient, as shown in FIG. 5 where the device 100 is placed readily within the palm 118 of a user's hand, but not as comprehensive as the indication provided by other embodiments of the invention, as set forth below.

[0018] In the embodiment shown in FIG. 6, a device 120 is constructed as described in detail in the aforesaid patents, Nos. 7,824,344 and 7,993,283, and is inserted into a reader 122 that employs an algorithm which converts a sensed color change into an accurate digital readout at a display 124, for a more accurate quantitative evaluation of the presence and level of a particular certain constituent carried by a bodily fluid sample.

[0019] In the embodiment illustrated in FIG. 7, a device 130 carries a strip 132 similar in construction to pad 22 described above, and arranged in a coil 134 held within the device 130. A sample of bodily fluid is applied to the strip 132, at a target area registered with an access door 140 through which the sample is passed to the strip 132. A color change is sensed and an algorithm converts the sensed color change into an accurate digital readout at a display 142. The used portion 144 of the strip 132 is advanced through a slot 146 and is torn off and discarded.

[0020] The embodiments illustrated in FIGS. 6 and 7 are conveniently available to a user wishing to control and maintain weight levels. Thus, for example, upon use of a device 120 or 130 in connection with monitoring the level of glucose in a bodily fluid, such as saliva, the algorithms provided by these embodiments can convert the detected glucose level into glycemic control readily understood and employed by a user in connection with a weight control regimen. In this manner, the user is provided with information to refine glycemic control, enabling the user to adjust diet, supplement intake and exercise for the purpose of glycemic control and weight control.

[0021] It will be seen that the present invention attains all of the objects and advantages summarized above, namely: Provides devices of simplified construction for widespread use in detecting, screening and monitoring the presence and level of any selected one of a plurality of certain constituents in bodily fluids; enables an exceptionally rapid response in a quick and easy non-invasive procedure for determining the presence and level of a particular constituent in a bodily fluid; provides for the economical manufacture and distribution of devices capable of detecting, screening and monitoring the presence of certain constituents in bodily fluids; makes available a simplified visual reading of a color change to determine the presence and level of a certain constituent in a bodily fluid; provides an economical and reliable device for simplified use in detecting, screening or monitoring the presence of a selected certain constituent in a bodily fluid; encourages widespread use to the benefit of a larger number of users who can enjoy greater economy and convenience in reaching and maintaining higher goals in healthcare.

[0022] It is to be understood that the above detailed description of preferred embodiments of the invention is provided by way of example only. Various details of design, construction and procedure may be modified without departing from the scope of the invention, as set forth in the appended claims.

Claims

1. A method of making a device for conducting a non-invasive analysis of a bodily fluid to determine the presence and the level of a certain constituent carried by the bodily fluid, the device including an indicator formulation capable of changing color in response to exposure to the certain constituent to provide a visible indication of the presence and the level of the certain constituent carried by the bodily fluid, the method comprising:

providing a carrier substrate of a fibrous non-woven material having voids establishing a high void volume within the carrier substrate wherein the carrier substrate has a total volume and the high void volume is within a range of about ten to twelve percent of the total volume;

applying a chromagen formulation to the carrier substrate to create a chromagen-laden carrier member with the chromagen formulation in the form of a layer carried by the fibers of the carrier material and placed in juxtaposition with voids in the carrier substrate; and

subsequently applying to the chromagen-laden carrier member a selected reagent having a particular constituent-specific formulation to combine the selected reagent with the chromagen formulation applied to the carrier substrate, thereby establishing the indicator formulation within the carrier substrate in place for reception of a sample of the bodily fluid later placed upon the carrier substrate.

2. The method of claim 1 including storing the chromagen-laden carrier member prior to subsequently applying the selected reagent.

3. The method of claim 1 wherein the chromagen formulation remains the same, while the selected reagent having a constituent-specific formulation is selected from reagents having formulations responsive to levels of any one of a plurality of different certain constituents.

4. A device for conducting a non-invasive analysis of a bodily fluid to determine the presence and the level of a certain constituent carried by the bodily fluid, the device including an indicator formulation capable of changing color in response to exposure to the certain constituent to provide a visible indication of the presence and the level of the certain constituent carried by the bodily fluid, the device comprising:

a carrier substrate of a fibrous non-woven material having voids establishing a high void volume within the carrier substrate wherein the carrier substrate has a total volume and the high void volume is within a range of about eight to twelve percent of the total volume; and

an indicator formulation in the form of a layer carried by the fibers of the carrier substrate placed in juxtaposition with voids in the carrier substrate, the indicator formulation consisting essentially of a chromagen formulation and a constituent-specific formulation selected from formulations responsive to levels of any one of a plurality of different certain constituents.

5. The method of claim 3 or the device of claim 4 wherein the different certain constituents are glucose, cholesterol, ethanol, uric acid, and galactose.

6. The method of claim 1 or the device of claim 5 wherein the chromagen formulation consists essentially of approximately equal parts of 0.05 to 0.5 M MBTH and 0.05 to 0.5 M DMAB.

7. The method or the device of claim 6 wherein the certain constituent is glucose and the constituent-specific formulation consists essentially of approximately equal amounts of the enzymes glucose oxidase with an activity of approximately 200 U/mg, and peroxidase with an activity of approximately 200 U/mg in the presence of approximately equal amounts of 0.05 to 0.5 M HEPES, a blend of surface active agents within the range of about 0.1% to 10% each, and a stabilizer.

8. The method or the device of claim 6 wherein the certain constituent is cholesterol and the particular constituent-specific formulation consists essentially of a selected amount of the enzyme cholesterol esterase with an activity of approximately 180 U/mg, the same selected amount of peroxidase with an activity of approximately 200 U/mg, and twice the selected amount of cholesterol oxidase with an activity of approximately 47 U/mg in the presence of approximately equal amounts of 0.05 to 0.5 M HEPES, a blend of surface active agents within the range of about 0.1% to 10% each, and a stabilizer.

9. The method or the device of claim 6 wherein the certain constituent is ethanol and the particular constituent-specific formulation consists essentially of approximately equal selected amounts of about 1% to 20% PVP K30, about 0.5% to 5.0% ethoxylated surfactant and about 0.05 to 0.5 M phosphate buffer at pH 8.5, one-half the selected amount of alcohol oxidase with an activity of approximately 400 U/ml and one-quarter the selected amount of peroxidase with an activity of approximately 200 U/mg.

10. The method or the device of claim 6 wherein the certain constituent is uric acid and the particular constituent-specific formulation consists essentially of approximately ten parts of uricase, about fifteen parts of ascorbate oxidase and about six parts of peroxidase with an activity of approximately 200 U/mg in 0.05 to 0.5 M phosphate buffered saline at pH 6.4.

11. The method or the device of claim 6 wherein the certain constituent is galactose and the particular constituents-specific formulation consists essentially of approximately five parts of about 0.05 to 0.5 M phosphate buffer at pH 7.0, approximately five parts of peroxidase with an activity of approximately 200U/mg, and approximately five parts of ethanol, in about twenty-five parts of 10% polyvinyl alcohol, and 4200 units of galactose oxidase.

12. The method of claim 1 or the device of claim 4 wherein the non-woven material of the carrier substrate comprises a non-woven synthetic polymeric material, and more preferably is a polyester.

13. The method of claim 1 or the device of claim 12 wherein the material of the carrier substrate comprises glass-fiber.

Ansprüche

1. Verfahren zur Herstellung einer Vorrichtung zur Durchführung einer nicht-invasiven Analyse einer Körperflüssigkeit, um das Vorliegen und die Konzentration eines bestimmten Bestandteils zu bestimmen, der von der Körperflüssigkeit getragen wird, wobei die Vorrichtung eine Indikatorformulierung aufweist, welche die Farbe ansprechend auf das Aussetzen an den bestimmten Bestandteil ändern kann, um eine sichtbare Anzeige des Vorliegens und der Konzentration des bestimmten Bestandteils zu liefern, der von der Körperflüssigkeit getragen wird, wobei das Verfahren umfasst:

Bereitstellen eines Trägersubstrats eines nicht-gewebten Fasermaterials mit Hohlräumen, die ein hohes Hohlraumvolumen innerhalb des Trägersubstrats etablieren, wobei das Trägersubstrat ein Gesamtvolumen aufweist und das hohe Hohlraumvolumen innerhalb eines Bereichs von ungefähr zehn bis zwölf Prozent des Gesamtvolumens liegt;

Aufbringen einer Chromagenformulierung auf das Trägersubstrat, um ein mit Chromagen beladenes Trägerelement mit der Chromagenformulierung in der Form einer Schicht zu erzeugen, die von den Fasern des Trägermaterials getragen wird und in Juxtaposition mit Hohlräumen in dem Trägersubstrat platziert wird; und

anschließendes Aufbringen, auf das mit Chromagen beladene Element, eines ausgewählten Reagenzes mit einer besonderen Bestandteil-spezifischen Formulierung, um das ausgewählte Reagenz mit der Chromagenformulierung zu kombinieren, die auf das Trägersubstrat aufgebracht wird, wodurch die Indikatorformulierung innerhalb des Trägersubstrats an einer Stelle für die Aufnahme einer Probe der Körperflüssigkeit, die später auf das Trägersubstrat platziert wird, etabliert wird.

2. Verfahren nach Anspruch 1,

umfassend ein Speichern des mit Chromagen beladenen Trägerelements vor dem anschließenden Aufbringen des ausgewählten Reagenzes.

3. Verfahren nach Anspruch 1,

wobei die Chromagenformulierung gleich bleibt, während das ausgewählte Reagenz mit einer Bestandteil-spezifischen Formulierung aus Reagenzien mit Formulierungen ausgewählt wird, die auf Konzentrationen eines beliebigen einen von mehreren verschiedenen bestimmten Bestandteilen ansprechen.

4. Vorrichtung zur Durchführung einer nicht-invasiven Analyse einer Körperflüssigkeit, um das Vorliegen und die Konzentration eines bestimmten Bestandteils zu bestimmen, der von der Körperflüssigkeit getragen wird, wobei die Vorrichtung eine Indikatorformulierung aufweist, welche die Farbe ansprechend auf das Aussetzen an den bestimmten Bestandteil ändern kann, um eine sichtbare Anzeige des Vorliegens und der Konzentration des bestimmten Bestandteils zu liefern, der von der Körperflüssigkeit getragen wird, wobei die Vorrichtung umfasst:

ein Trägersubstrat eines nicht-gewebten Fasermaterials mit Hohlräumen, die ein hohes Hohlraumvolumen innerhalb des Trägersubstrats etablieren, wobei das Trägersubstrat ein Gesamtvolumen aufweist und das hohe Hohlraumvolumen innerhalb eines Bereichs von ungefähr zehn bis zwölf Prozent des Gesamtvolumens liegt; und

eine Indikatorformulierung in der Form einer Schicht, die von den Fasern des Trägersubstrats getragen wird und in Juxtaposition mit Hohlräumen in dem Trägersubstrat platziert wird, wobei die Indikatorformulierung im Wesentlichen aus einer Chromagenformulierung und einer Bestandteil-spezifischen Formulierung besteht, welche aus Formulierungen ausgewählt wird, die auf Konzentrationen eines beliebigen einen von mehreren verschiedenen bestimmten Bestandteilen ansprechen.

5. Verfahren nach Anspruch 3 oder Vorrichtung nach Anspruch 4,

wobei die verschiedenen bestimmten Bestandteile Glucose, Cholesterin, Ethanol, Harnsäure und Galactose sind.

6. Verfahren nach Anspruch 1 oder Vorrichtung nach Anspruch 5,

wobei die Chromagenformulierung im Wesentlichen aus ungefähr gleichen Teilen von 0,05 bis 0,5 M MBTH und 0,05 bis 0,5 M DMAB besteht.

7. Verfahren oder Vorrichtung nach Anspruch 6,

wobei der bestimmte Bestandteil Glucose ist, und die Bestandteil-spezifische Formulierung im Wesentlichen aus ungefähr gleichen Mengen der Enzyme Glucoseoxidase mit einer Aktivität von ungefähr 200 U/mg und Peroxidase mit einer Aktivität von ungefähr 200 U/mg in Anwesenheit von ungefähr gleichen Mengen von 0,05 bis 0,5 M HEPES, einer Mischung oberflächenaktiver Stoffe innerhalb des Bereichs von etwa jeweils 0,1 % bis 10 % und einem Stabilisator besteht.

8. Verfahren oder Vorrichtung nach Anspruch 6,

wobei der bestimmte Bestandteil Cholesterin ist, und die besondere Bestandteil-spezifische Formulierung im Wesentlichen aus einer ausgewählten Menge des Enzyms Cholesterinesterase mit einer Aktivität von ungefähr 180 U/mg, derselben ausgewählten Menge an Peroxidase mit einer Aktivität von ungefähr 200 U/mg und der zweifachen ausgewählten Menge an Cholesterinoxidase mit einer Aktivität von ungefähr 47 U/mg in Anwesenheit ungefähr gleicher Mengen von 0,05 bis 0,5 HEPES, einer Mischung oberflächenaktiver Stoffe innerhalb des Bereichs von jeweils etwa 0,1 % bis 10 % und einem Stabilisator besteht.

9. Verfahren oder Vorrichtung nach Anspruch 6,

wobei der bestimmte Bestandteil Ethanol ist, und die besondere Bestandteil-spezifische Formulierung im Wesentlichen aus ungefähr gleichen ausgewählten Mengen von ungefähr 1 % bis 20 % PVP K30, etwa 0,5 % bis 5,0 % ethoxyliertem grenzflächenaktiven Stoff und ungefähr 0,05 bis 0,5 M Phosphatpuffer bei pH 8,5, einer Hälfte der ausgewählten Menge an Alkoholoxidase mit einer Aktivität von ungefähr 400 U/ml und einem Viertel der ausgewählten Menge an Peroxidase mit einer Aktivität von ungefähr 200 U/mg besteht.

10. Verfahren oder Vorrichtung nach Anspruch 6,

wobei der bestimmte Bestandteil Harnsäure ist, und die besondere Bestandteil-spezifische Formulierung im Wesentlichen aus ungefähr zehn Teilen Uricase, etwa fünfzehn Teilen Ascorbatoxidase und etwa sechs Teilen Peroxidase mit einer Aktivität von ungefähr 200 U/mg in 0,05 bis 0,5 M phosphatgepufferter Kochsalzlösung bei pH 6,4 besteht.

11. Verfahren oder Vorrichtung nach Anspruch 6,

wobei der bestimmte Bestandteil Galactose ist, und die besondere Bestandteil-spezifische Formulierung im Wesentlichen aus ungefähr fünf Teilen etwa 0,05 bis 0,5 M Phosphatpuffer bei pH 7,0, ungefähr fünf Teilen Peroxidase mit einer Aktivität von ungefähr 200 U/mg und ungefähr fünf Teilen Ethanol in etwa fünfundzwanzig Teilen 10 % Polyvinylalkohol und 4200 Einheiten Galactoseoxidase besteht.

12. Verfahren nach Anspruch 1 oder Vorrichtung nach Anspruch 4,

wobei das nicht-gewebte Material des Trägersubstrats ein nicht-gewebtes synthetisches Polymermaterial umfasst, und bevorzugter ein Polyester ist.

13. Verfahren nach Anspruch 1 oder Vorrichtung nach Anspruch 12,

wobei das Material des Trägersubstrats Glasfasern umfasst.

Revendications

1. Un procédé de fabrication d'un dispositif pour effectuer une analyse non invasive d'un fluide corporel afin de déterminer la présence et le niveau d'un certain constituant porté par le fluide corporel, le dispositif comprenant une formulation d'indicateur capable de changer de couleur en réponse à l'exposition au certain constituant pour fournir une indication visible de la présence et du niveau du certain constituant porté par le fluide corporel, le procédé comprenant:

la fourniture d'un substrat de support d'un matériau fibreux non-tissé ayant des vides établissant un volume de vide élevé dans le substrat de support; dans lequel le substrat de support a un volume total et le volume de vide élevé est dans la plage d'environ dix à douze pourcent du volume total ;

l'application d'une formulation de chromagène sur le substrat de support pour créer un élément de support chargé de chromagène sous la forme d'une couche supportée par les fibres du matériau de support et placée en juxtaposition avec les vides du substrat de support ;
et

ensuite l'application à l'élément de support chargé de chromagène d'un réactif sélectionné ayant une formulation particulière spécifique pour un constituant pour combiner le réactif sélectionné avec la formulation de chromagène appliquée au substrat support, établissant ainsi la formulation d'indicateur dans le substrat de support en place pour la réception d'un échantillon du fluide corporel placé plus tard sur le substrat de support.

2. Le procédé selon la revendication 1, comprenant le stockage de l'élément de support chargé de chromagène avant l'application subséquente du réactif sélectionné.

3. Le procédé selon la revendication 1, dans lequel la formulation de chromagène reste la même, tandis que le réactif sélectionné ayant une formulation particulière spécifique pour un constituant est choisi parmi des réactifs ayant des formulations sensibles aux niveaux de l'un quelconque d'une pluralité de certains constituants différents.

4. Un dispositif pour effectuer une analyse non invasive d'un fluide corporel afin de déterminer la présence et le niveau d'un certain constituant porté par le fluide corporel, le dispositif comprenant une formulation d'indicateur capable de changer de couleur en réponse à l'exposition au certain constituant pour fournir une indication visible de la présence et du niveau du certain constituant porté par le fluide corporel, le dispositif comprenant:

un substrat de support d'un matériau fibreux non-tissé ayant des vides établissant un volume de vide élevé dans le substrat de support; dans lequel le substrat de support a un volume total et le volume de vide élevé est dans la plage d'environ huit à douze pourcent du volume total ;

une formulation d'indicateur sous la forme d'une couche supportée par les fibres du matériau de support et placée en juxtaposition avec les vides du substrat de support, la formulation d'indicateur essentiellement consistant d'une formulation de chromagène et d'une formulation spécifique pour un constituant choisie parmi les formulations qui répondent à des niveaux de l'un quelconque d'une pluralité de certains constituant différents.

5. Le procédé selon la revendication 3 ou le dispositif selon la revendication 4, dans lequel les différents constituants sont le glucose, le cholestérol, l'éthanol, l'acide urique et le galactose.

6. Le procédé selon la revendication 1 ou le dispositif selon la revendication 5, dans lequel la formulation de chromagène est constituée essentiellement de parties approximativement égales de 0,05 à 0,5 M de MBTH et de 0,05 à 0,5 M de DMAB.

7. Le procédé ou le dispositif selon la revendication 6, dans lequel le certain constituant est le glucose et la formulation spécifique du constituant consiste essentiellement en quantités approximativement égales des enzymes glucose oxydase ayant une activité d'environ 200 U/mg et peroxydase ayant une activité d'environ 200 U/mg dans la présence de quantités approximativement égales de 0,05 à 0,5 M de HEPES, d'un mélange d'agents tensioactifs dans la gamme d'environ 0,1% à 10% chacun, et d'un stabilisant.

8. Le procédé ou le dispositif selon la revendication 6, dans lequel le certain constituant est le cholestérol et la formulation particulière spécifique pour le constituant consiste essentiellement en une quantité sélectionnée de l'enzyme cholestérol estérase avec une activité d'environ 180 U/mg, en la même quantité sélectionnée de peroxydase avec une activité d'environ 200 U/mg, et en deux fois la quantité sélectionnée de cholestérol oxydase avec une activité d'environ 47 U/mg en la présence de quantités approximativement égales de 0,05 à 0,5 M de HEPES, d'un mélange d'agents tensioactifs dans la gamme d'environ 0,1% à 10% chacun, et d'un stabilisateur.

9. Le procédé ou le dispositif selon la revendication 6, dans lequel le certain constituant est l'éthanol et la formulation particulière spécifique pour le constituant consiste essentiellement en des quantités sélectionnées approximativement égales d'environ 1% à 20% de PVP K30, d'environ 0,5% à 5,0% d'agent tensioactif éthoxylé et d'environ 0,05 à 0,5 M de tampon phosphate à pH 8,5, de la moitié de la quantité sélectionnée d'alcool oxydase avec une activité d'environ 400 U/ml et d'un quart de la quantité sélectionnée de peroxydase avec une activité d'environ 200 U/mg.

10. Le procédé ou le dispositif selon la revendication 6, dans lequel le certain constituant est l'acide urique et la formulation particulière spécifique pour le constituant consiste essentiellement en environ dix parties d'uricase, environ quinze parties d'ascorbate oxydase et environ six parties de peroxydase avec une activité d'environ 200 U/mg en 0,05 à 0,5 M de solution saline tamponnée au phosphate à pH 6,4.

11. Le procédé ou le dispositif selon la revendication 6, dans lequel le certain constituant est le galactose et la formulation particulière spécifique pour le constituant consiste essentiellement en environ cinq parties de tampon phosphate environ 0,05 à 0,5 M à pH 7,0, environ cinq parties de peroxydase avec une activité d'environ 200 U/mg et environ cinq parties d'éthanol, dans environ vingt-cinq parties d'alcool polyvinylique à 10%, et 4200 unités de galactose oxydase.

12. Le procédé selon la revendication 1 ou le dispositif selon la revendication 4, dans lequel le matériau du substrat de support comprend un matériau polymère synthétique non tissé, et plus préférablement un polyester.

13. Le procédé selon la revendication 1 ou le dispositif selon la revendication 12, dans lequel le matériau du substrat de support comprend de la fibre de verre.

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